• Adobe After Effects Expressions

  replace single key of multiple

  Posted by Andy Engelkemier on December 5, 2019 at 4:07 pm

  why do I always figure it out Right after posting!?!

  SO I wanted to change one value of the first key, but leave the second value alone.
  Documentation is NOT helpful for people who are not already good a programming. It over explains some things, and doesn’t explain the part that you need to know. But, that’s most help files right?

  I didn’t understand the syntax for linear()
  First, that’s hard to search for. And I still don’t know what I can do with it.
  But here’s what worked….

  if (numKeys > 1){
t1 = key(1).time;
t2 = key(2).time;
SlideScale = thisComp.layer("AdjAll").effect("MastScale")("Slider");
v1 = [SlideScale, SlideScale]
v2 = key(2).value;

  linear(time, t1, t2, v1, v2);
} else {
value
}

  It’s getting the time of when the key is happening in t1 and t2. Then recording the new values for v1 and v2. V2 is just key(2).value because I want it to be the current value unchanged. But since you can’t Change a key, you have to write an overly complicated script to basically just recreate all your keys. :/

  I would have liked to just change the first key.
  Was there an easier way to do this?
  Does anyone know where a good explanation of this method exists? I do understand the catch there. If you go to change a key and end up with less than 2 keys, you’ll break things, so if that happens it’s just defaults back to making no change (else, value)

  I just don’t understand what other methods I could use in place of time, in “linear(time, t1, t2, v1, v2)”

  And what if I have more keys and want to use the first and last, or just be able to define a bunch. Would i have to split these statements into a Bunch of statements after evaluating which keys they are? Because, Wow that would suck.

  Andy Engelkemier replied 6 years, 5 months ago 1 Member · 0 Replies
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